Muffler with sliding auxiliary tube



July 17, 1956 B. c. KIRBY 2,754,927

MUFFLER WITH SLIDING AUXILIARY TUBE Filed Jan. 20, 1955 INVENTOR. Bernard 6! 767g ATTD RN EYE United States Paten r MUFFLER WITH SLIDING AUXILIARY TUBE "Bernard C; Kirby, Los Angeles, Calif. Application January 20, 1955, Serial No. 482,929

S-CIaims. (Cl. 181-61) fThis invention relates toun'ufliers of the type used in exhaust pipes of motor vehicles andparticularly Where "mutllers are "provided with auxiliary tubes to facilitate exhausting gases therefrom, and in particular, an auxiliary opposite toth'at in which said outer tube is anchored and the flared 'inner'ends of the nipple and inner tube are adapted to slide longitudinally in the outer tube and nipple, respectively.

The purpose of this invention is to provide means in a muffler having an auxiliary gas relieving tube extended therethrough to compensate for expansion and contraction to prevent breaking of joints between the tubes.

This invention includes a -muffler that is an improvement over the muffler of my'prior Patent No. 2,229,576 in that whereas both ends of the auxiliarytubes are anchored, suchas by welding, to ends of the mulfler in the patent, opposite ends of the tubes are respectively anchored to ends of the mufller whereby inwardly extended ends of the tubes are slidable whereby one tube is adapted to expand and contract in relation to the other and also wherein the tubes are adapted to expand-and contract in relation to the'mu filer housing.

Mulliers, such'as used in motor vehicles, are subjected to intense heatwith the result'that maximum expansion and contraction is constantly taking place between the parts and elements extended through parts, such as partitions of *mufflersate subjected to internal" strains and stresses which breakthe elements andalso connections between the elements. With thisthoughtin mind, this invention contemplates an auxiliary gas relieving tube extended longitudinally through a'mufiier with an inner tube connected, at one end, to an outer tube'and with the opposite ends in spaced relation and an intermediate nipple extended between the tubes 'and anchored in the 'inulder whereby with engaging parts of the tubes in sliding relation the tubes are free to expand andcontract without being subjected to internal strains andstresses.

The object of this invention is, therefore, to provide an improved muftler of the type-having an auxiliary gas relieving tube extended thereth'rou gh inwhich oneend only of the tube is anchored so that 'the opposite portion formed with slidably mounted inner,*o'utcr'-and intermediate sections and in which the muffler is of a simple and economical construction.

With these and other objects and advantages in view, the invention embodies an outer cylindrical housing having transversely disposed partitions with openings therein and with inlet and outlet connections at the ends in which an auxiliary tube extended through a portion of the housing is anchored to the housing at one end and an inner tube positioned in the auxiliary tube is connected to the auxiliary tube at one end of the mufiler, and also in which the inner end of a nipple anchored in the opposite end of the mufller extends between the inner and outer or auxiliary tubes providing sliding connections that permit expansion and contraction of the elements.

Other features and advantages of the invention will appear from the following description, taken in connection with the accompanying drawing, wherein:

Figure 1 is a longitudinal section through the improved mother.

Figure 2 is a section, similar to that shown in Figure l, with the parts shown on an enlarged scale and with parts broken away, illustrating the construction and arrangement ofthe auxiliary gas relieving tube.

Figure 3 is a cross section through the mufller taken on line 33 of Figure 1.

Figure 4 is a similar section through the mufller taken on line 44 of: Figure 1.

Figure 5 is a cross section through the inner tube of the auxiliary tube being taken on line 55 of Figure 2, the parts being shown on an enlarged scale.

Figure 6 is a longitudinal section through the mufiler, similar to that shown in Figure 2, illustrating a modification wherein the inner tube extends through the end of the housing providing means for eliminating the intermedia'tenipple or tube.

Referring now to the drawing, wherein like reference characters denote corresponding parts, the improved mufller of this invention includes a housing 10 having an inlet connection 11 extended from one end and an outlet connection 12 extended from the opposite end, and an auxiliary tube including an outer tube 13, an inner tube 14, and an intermediatetube or nipple lz'l extended throughone side of the housing and adapted to facilitate passage of exhaust gases through the muffler.

The housing 19 is provided with end walls 16 and 17 at the inlet end and 18 and 19 at the outlet end and the intermediate part-of the housing is provided with spaced partitions2t), 21,22 and 23. The partition 2t) is provided with openings 24, the partition 21 with openings 25 and tube 13 extends and, as illustrated in Figure l, the tube 13 extends from a point 27 at'the inlet end of the housing to apoint28 spaced inwardly from the wall 1? at the outlet end. The end'ofthe tube 14 at the inlet end of the housing is providedwith an outwardly flared section 29 the peripheral edge of which is secured, such-as by welding, to the extended end of-the outer tube 13 and the opposite'endofthe' inner tubeisprovided with an outwardly flared section 30that extends for sliding engagement'wi'th'the inner surface-of the intermediate tube 15.

'Theinner end or the intermediatetube 15 is provided withan'outwardly flared section 31 that extends for sliding engagementwith the inner surfaceof the outer tube 13. 'The'outer end of tube 15 is formed with a bend, as

indicated'by the numeral 32.

The outer tube 13 is anchored, such asby welding, to the end plates or heads 16 and 17, as shown at'the points 33 and 34, and the opposite end and also intermediate portion of the tube are free to slide longitudinally upon expansion and contraction of the parts, and the intermediate tube is secured, such as by welding, as shown at the point to the end wall or head 19 whereby the inner portion with the flared section 31 extends between the tubes 13 and 14, as illustrated in Figure 2.

The outer tube 13 is provided with perforations 36 and the inner tube 14 with openings 37 formed by sections 38 being struck from the wall of the tube and extended inwardly as shown in Figures 2 and 6, Figure 6 showing a modification.

With the parts assembled as shown and described, air passing through the inner tube 14 with forward progress of a vehicle upon which the muffler is installed creates a low pressure area or partial vacuum beyond the elements 38 whereby gases between the tubes 13 and 14 are drawn into the air passing through the inner tube and gases accumulating in areas between the transversely disposed partitions of the housing are drawn through the openings 36 into the area between the tubes 13 and 14 and through the openin s 37 into the air stream passing through the inner tube.

In the design illustrated in Figure 6, an inner tube 40, similar to the tube, 14 and which is provided with an outwardly flared section 41 is secured, such as by welding, at the point 42 with the extended end of an outer tube 43, similar to the tube 13, at the inlet end of the muffler and the opposite end of the inner tube extends through an opening 44 in an end wall or head 45 at the discharge or outlet end of the mufller housing 46, thereby replacing the intermediate tube or nipple 15.

In this design, the tube 40 is provided with openings 47 that are formed by sections 48 being struck from the wall of the tube, similar to the sections 38 of the design shown in Figure 2, and, in this design, air passing through the tube 40 draws gases from the area between the tubes 40 and 43, the gases being drawn into the area between the tubes through openings 49 in the tube 43.

The openings 47 of the design shown in Figure 6 and 37 of the design shown in Figure 2 are formed with the portions 48 and 38, respectively, struck from the Wall of the tube and bent inwardly providing a crimped section such as that indicated by the numeral 38 in Figure 5.

With the parts as illustrated in Figure 6, the outer tube 43 is secured, such as by welding, as shown at the point 50 to an end wall 51 of the rnufiier housing, and the opposite end is free to slide longitudinally through the housing.

With the outwardly flared end 41 of the tube 40 secured, such as by welding, as shown at the point 42, to the end of the outer tube 43 and with the opposite end of the inner tube slidably mounted in the end wall of the housing the tubes are free to slide longitudinally to compensate for expansion and contraction whereby stresses and strains in the materials of the tubes are eliminated.

With the parts designed and assembled in this manner, rattling due to loose connections between the parts is eliminated and with the usual strains resulting from expansion and contraction of the elements eliminated the parts are adapted to wear indefinitely.

It will be understood that modifications, within the scope of the appended claims, may be made in the design and arrangement of the parts without departing from the spirit of the invention.

What is claimed is:

1. A muffler comprising an elongated housing having end walls with an inlet connection in one of said end walls and an outlet connection in the end wall at the opposite end of the housing, an auxiliary tube having perforations therein secured to and extended inwardly from the end wall at one end of the housing, and a tube secured to and extended inwardly from the end wall in the inner end of the housing opposite to that from which the auxiliary tube extends into said auxiliary tube and being freely slidable therein.

2. A muffler comprising an elongated housing having an end wall with an inlet connection therein at one end and an end wall with an outlet connection therein in the opposite end, an outer tube anchored in the end wall in which the inlet connection is provided and extended through the intermediate part of the housing, and an inner tube secured to the end of the outer tube positioned in the end wall in which the inlet connection is provided and extended through an opening in the end wall in which the outlet connection is provided, the end of the inner tube extended through the opening of the end wall in which the outlet connection is positioned and being freely mounted in said wall whereby a sliding connection is provided to compensate for expansion and contraction of the different elements of the muffler said outer tube having perforations therein and said inner tube having openings in the wall thereof with portions of the wall extended inwardly adjacent the openings to provide low pressure areas whereby air passing through the tube draws gases from the area between the inner and outer tubes and through the perforations of the outer tube from the interior of the mufller housing.

3. A muffler comprising an elongated housing having transversely disposed partitions with openings therein positioned in the intermediate part and having an end wall with an inlet connection at one end and an end wall with an outlet connection at the opposite end, an outer tube having perforations therein extended through the end wall in which the inlet connection is positioned and also through said partitions, an inner tube having openings with inwardly extended elements in the wall thereof positioned in the outer tube, the end of the inner tube adjacent the end wall of the housing in which the inlet connection is positioned being secured, such as by welding, to the outer tube, and an intermediate tube having a flared inner end extended through the end wall of the housing in which the outlet connection is positioned, the inwardly extended end of said intermediate tube being positioned between said inner and outer tubes and being freely slidable in the area between the inner and outer tubes.

4. In a muflier, the combination which comprises an elongated cylindrical housing having an end plate with an inlet connection therein at one end and an end plate with an outlet connection therein at the opposite end, an auxiliary tube extended through the housing and including an outer tube having perforations therein extended through the end of the housing in which the inlet connection is positioned and anchored, such as by welding, to the end wall of the housing, an inner tube positioned in the outer tube and having an outwardly flared end secured, such as by welding, to the end of the outer tube extended through the end wall in which the inlet connection is provided, and an intermediate tube having an outwardly flared inner end extended through and anchored in the tube wall in which the outlet connection is positioned, said intermediate tube extending between the inner and outer tubes and the end of the inner tube positioned in the intermediate tube having an outwardly flared section thereon, said inner tube having openings in the wall thereof.

5. In a muflier, the combination which comprises an elongated cylindrical housing having an end plate with an inlet connection therein at one end and an end plate with an outlet connection therein at the opposite end, an auxiliary tube extended through the housing and in cluding an outer tube having perforations therein extended through the end of the housing in which the inlet connection is positioned and anchored, such as by welding, to the end wall of the housing, an inner tube positioned in the outer tube and having an outwardly flared end secured, such as by welding, to the end of the outer tube extended through the end wall in which the inlet connection is provided, and an intermediate tube having an outwardly flared inner end extended through and anchored in the end wall in which the outlet connection extended sections coacting therewith to provide low presis positioned, said intermediate tube extending between ure areas therein. the inner and outer tubes and the end of the inner tube positioned in the intermediate tube having an outwardly References Clted m the file of thls patent flared section thereon, said inner tube having openings 5 UNITED STATES PATENTS in the wall thereof and said inner tube having inwardly 2,229,576 Kirby Jan. 21, 1941 

